Special topics
Cloud detection
discussion of detection of clouds, especially low and very low clouds
Water vapor absorption
Which errors occur due to water vapor absorption at 905-920 nm wavelengths and how can these effects be corrected?
Signal distortion in the free troposphere
What is the reason for signal distortions (CL31 and CL51) in the free troposphere and how can this effect be corrected?
Calibration
here you can find discussion about calibration issues (Rayleigh and cloud calibration )
Overlap
Discussion of overlap effects and overlap measurements
PBL retrievals
What are differences between different PBL retrievals? Under which conditions can PBL retrieved (or not)?
Any other topic
Any other topic can be added here if needed and if somebody wants to provide content and takes the lead in the corresponding discussion
instrument-to-instrument variability
Rain
During rain the ceilometer signals vary significantly
Dark current measuremets
from time to time dark current measurements are performed; overview of results are shown here
Detector Saturation
Examples of detector saturation